Remove spi locking hack + increase max sd frequency

These two changes (mostly the former) dramatically increase
responsiveness when doing database updates; previously we were suffering
from some nasty priority inversion.

afaict the underlying need to acquire_spi seems to be fixed? i.e. spi
bus acquisition is working properly. fingers heavily heavily crossed.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/drivers/display.cpp b/src/drivers/display.cpp
index b0a97b30..e28b6b47 100644
--- a/src/drivers/display.cpp
+++ b/src/drivers/display.cpp
@@ -296,6 +296,8 @@ void Display::SendTransaction(TransactionType type,
 void Display::OnLvglFlush(lv_disp_drv_t* disp_drv,
                           const lv_area_t* area,
                           lv_color_t* color_map) {
+  spi_device_acquire_bus(handle_, portMAX_DELAY);
+
   // First we need to specify the rectangle of the display we're writing into.
   uint16_t data[2] = {0, 0};
 
@@ -314,6 +316,8 @@ void Display::OnLvglFlush(lv_disp_drv_t* disp_drv,
   SendCommandWithData(displays::ST77XX_RAMWR,
                       reinterpret_cast<uint8_t*>(color_map), size * 2);
 
+  spi_device_release_bus(handle_);
+
   if (!first_flush_finished_ && lv_disp_flush_is_last(disp_drv)) {
     first_flush_finished_ = true;
     SetDisplayOn(display_on_);